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5.4.3
Roll to roll
When webbing for an image roll to roll process, the lower front unwind/wind-up shaft is
used as a supply (unwind) shaft for the images.
Single sided lamination;
When laminating single sided the unwind/windup shaft in the rear of the lower section can
be used to wind-up the completed product (Figure 20, A).
Note:
To prevent adhesive residues from staying behind on the bottom roller use a release
liner in the bottom section and follow the double sided lamination process. The release
liner can easily be removed later on.
Double sided lamination;
The unwind/wind-up shaft in the rear of the upper section is used to wind-up the processed
images (Figure 20, B).
This means the top laminate (with or without release liner) must be webbed on the top
unwind shaft in the upper section and in the lower section only a laminate without a
release liner can be used.
Figure 20: Webbing image from roll to roll.
The laminates are webbed first;
1. Web the upper and lower section laminates as described in the previous sections.
2. Feed the films with a leader board through the nip.
3. When the leader panel is through the nip, cut off the leader panel.
4. Stick the leading edge of the films at the rear side of the machine onto the cylinder on
the wind-up shaft.
5. Set the tension control for this shaft to wind-up tension.
6. Set the nip to zero (no pressure).
7. Pull the image to the front and feed it over the in-feed table into the nip.
Unloading
When the image roll is empty and through the nip, cut the films at approximately the same
length and let the machine run until the end is through the nip.
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